Dynamo-electric machine.



J. E. 'NOEGGERATI-I. DYNAM ELECTRIC MACHINE. APPLMATION FILED APR. 21. 19,10.

Patented Oct. 29, 1912.

Witnessesi g Inventor JakobE Noe gerath, b9 y HISIXFLtm-neg UNITED s'rnrns ernten? InRosa- NOEGGERMR or'sonnnnonlinr,` New rank, assienonjro seminar.A f

^ 15mErminiorientranti?7 A conroRATioNpoF NEWYORK.

DYNAMo-nnncrnrc MACHINE" Specification of Letters Patent. i pplication filed April ZLVBYIO. Serial No. $56,656.

Patented Oct. 29, 191 2.

Y To all `whom it may concern."

.v lication.

f .Be-it knownl that I, 'JAKoB ElNoaGonRA'rrr,

va citizen of the United Statesmresiding at Schenectady, county of Schenectady, State of New York, have invented certain neivand useful Improvements' in 'Dynamo Electric Machines, of' which the following is a speci- My inventionrelates to dynamo electric machines 'of the type known as unipolar, and has spe/cial reference to low voltage machines in Awhich armaturev conductors are dispensed with. f

It yisthe'object of myinvention to so construct amachine of this character that a pluralityof voltages' may be' generated' in a machine in lwhich the Whole` armature body soA forms the activematerial in which the electromotive force of the: machine is induced.

My invention'r consists in an armature body rotatably mounted in a unipolar eld' struct ture', 'said body 'comprising ltvvo conductingV portionsinsulatedfrom eachother, one portionbeing' reduced in diameter for a'partof its length and the other portion fitting over By so .l'eon-- structing' a lunip'olar machine andby con-v nectin'g the two portionsof the armaturein .series with theoutside circuinl am enabled'V to operate itat Substantially double the volt#l 4the. part reducedin diameter.

. age'thatfc'angbef obtainedlfrom the machine heretofore,employed,- in which fthe Whole armaturebody forms the activematerial in which the .electromotive force of the machine is" induced; v'By `arranging theportions of the' .armature peripheral speed can be used. My invention Awill best be i reference to the following description .taken inconnect on with `the accompanying' dravvthroughout .Figure 1 isa view, partlyin section, of a unipolary machine -embodying my invention; and Fig. 2 is afsectional view of a modifi- Similar referencey numerals will be used the specification and the several figures of the draw-'ing to denote like parts.

InFi l,

provide with suitable magnet-izing coils 2 and arranged to produce a unipolar yfield flux( The armature body body so; that they have` the ysame 'outside diameter and a small radial non-magnetic gap between' the. portions, the 'greatest vflux carrying `section fora given understood by 1 represents the field structure is rotatably vmounted-in 'the lfield c arriedona suitable shaft Si .It is provided with two sets armature, if-The flux may "be considered as' entering. tha armature tbody. at ythe central an' gap 6' between thel two sets of collector through` the .armature andneturning out-v wardly. into the field structure through' the right. `and left 'air gaps'? and S. The collector ringsfmay be in contact with the arwhich case ythe collectingbrushes should be to avoid eddycurrent losses, or the arrangementshown in" y Patent No. 805,315, dated Nov. 21, 1905, may be used. i Y

` Thel armature body ycomprises two con ducting portions'Q and 10 insulated from each -other, the portion 10 surrounding the `portion 9; The portion't), which is cylindii cal in shape, isv preferably reduced in diside diameters of both portions on which the collector rings are located are the same.

' 10 is placedin position on the portion-9' of shrunk or otherwise suitablyl iitted on ,the portion 9 of the .armature bodyso as to nake both ends'l of the 'armature ofthe same diameter. By shrinking the sleevell in place vthe 'above description, it will. be seen vthat has apart 1 3 which overhangs the insulation to keep it vin place against centrifugal force.

Half of each set of collector rings mounton one end of the armature is mounted .on

on the sleeve. 1-1. f The number of collector rings used depends on the 'amount of current amet'er Where the portion 10, which is in theKAY form of a shell, fits therecinso that the out- '.In'this case,nafter the port-ion or shell the armature body, a sleeve or shell 'l1 is a good electrical contact is made. Fromy both'portions ofthe armature 'body carry the' ed on` the shelly 10, the other halfA of the set.

of collector? rings at opposite ends ofthe 'rings' and there dividing, passing axially "'inature aroundA itsv entire periphery, in-

distributed/around the colector rings solas In the form Ishovvnin Fig. 1, the sleeve 11 the portion 9- and the other half ofthe set on the other end of thearmature is mounted brushes.

io be. collected, a greater number being used when l Willl order small currents are to be collected in ro reduce the contact resistance of the En the modification shown in Fig. 2, the collector rings are dispensed with andthe current collected directly from the portions 9 and l0. In Fig. 2, the enlarged ends oi the sleeve ll andsh'ell l0 have the same outside diameter and the insulation is held in glace against centrifugal force by the band 14.

y I desire it to be understood that my invention not limited to the particular construction shown and described, and l aim in the appended claims to cover all modifications which do not depart from the spirit and scope of my invention.

What l claim es new and desire to secure by Letters Patent of the United States, is,--

l. in a dynamo electric machine, anni- Dolar .field structure. an armature body v'i'o- `atabhv mounted in said field comprising two conducting portions insulated from one an- `ther, one of which is reduced indiameter tor a partoit' its length and the other is in the form of a shell fitting over'said part reduced in diameter, collector rings on both of said portions of theyarmature body near the ends thereof, the outside diameters of both portions on which the collector rings are located., being substantially the saine.

l'n a dynamo electric machine, a unipolar field structure, an armature body conm` Y prising a large currents are to be collected than cylindrical conducting portion rcduced in diameter for a part of its length, a conducting shell .fitting over said part reduced in diameter and insulated therefrom, and a sleeve also fitting over said part reduced in diameter but-in electrical contact therewith.

3. ln a dynamoelectric machine, a unipolar field structure, an armature body comprising a cylindrical conducting portion reduced in diameter for part of its length, a conducting shell fitting over said part reduced in diameter, and a sleeve also fitting over said part reduced in diameter and in electrical contact therewith, said shell being separated from said portion and said sleeve by radial non-magnetic gaps.

4. In a dynamo electric machine, a unid polar eld structure, an armature body comprising a cylindrical conducting portion reduced in diameter for part of its length, a conducting shell fitting over said part re,- duced in diameter and a sleeve also litting over said part reduced in diameter and in electrical contact therewith, said sleeve and shellv having their abutting ends enlarged, said shell being separated from said portion and said sleeve by radial non-magnet1c gaps.

In Witness whereof, I have hereunto se# my hand this 18th day of April, 1910.

JAKOB E. NOEGGERAT? l.

Witnesses:

BENJAMIN B. HULL, HELEN ORronD.

fepes cf this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

